linux-kernel - Re: [PATCH net v3 2/3] net: stmmac: Consider Tx VLAN offload tag length for maxSDU

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Message-ID: <d7bbb7dd-ddc6-43d6-b234-53213bde71bd@altera.com>
Date: Fri, 17 Oct 2025 13:06:34 +0530
From: "G Thomas, Rohan" <rohan.g.thomas@...era.com>
To: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <Jose.Abreu@...opsys.com>,
 Rohan G Thomas <rohan.g.thomas@...el.com>,
 Boon Khai Ng <boon.khai.ng@...era.com>
Cc: netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Matthew Gerlach <matthew.gerlach@...era.com>
Subject: Re: [PATCH net v3 2/3] net: stmmac: Consider Tx VLAN offload tag
 length for maxSDU

Hi All,

On 10/17/2025 11:41 AM, Rohan G Thomas via B4 Relay wrote:
>   
> +	sdu_len = skb->len;
>   	/* Check if VLAN can be inserted by HW */
>   	has_vlan = stmmac_vlan_insert(priv, skb, tx_q);
> +	if (has_vlan)
> +		sdu_len += VLAN_HLEN;
> +
> +	if (priv->est && priv->est->enable &&
> +	    priv->est->max_sdu[queue] &&
> +	    skb->len > priv->est->max_sdu[queue]){

I just noticed an issue with the reworked fix after sending the patch.
The condition should be: sdu_len > priv->est->max_sdu[queue]

I’ll send a corrected version, and will wait for any additional comments
in the meantime.

> +		priv->xstats.max_sdu_txq_drop[queue]++;
> +		goto max_sdu_err;
> +	}
>   
>   	entry = tx_q->cur_tx;
>   	first_entry = entry;
> 

Best Regards,
Rohan